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Kong W.,Qingdao University | Kong W.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | Cao K.,Qingdao University | You C.,Qingdao University | And 6 more authors.
Guangxue Xuebao/Acta Optica Sinica | Year: 2013

An anti-reflective grating used for solar cell is proposed based on SiO2/TiO2 film to reduce its surface loss. It consists of substrate, relief structure and surface thin film. Rigorous coupled wave theory and genetic algorithm are employed to optimize the parameters such as groove depth, duty cycle, incident angle and thickness of surface thin film according to the merit function of the weighted average reflectivity. The optimized grating has the lower weighted average reflectivity than 2.16% with the incident wavelength from 300 nm to 1100 nm and the incident angle around ±40°. The lowest weighted average reflectivity is only 1.04%. Simulation results show sufficient manufacture tolerance of the designed grating. Source


Liu S.-L.,Qingdao University | Long Y.-Z.,Qingdao University | Long Y.-Z.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | Huang Y.-Y.,Qingdao University | And 6 more authors.
Polymer Chemistry | Year: 2013

Solvent recovery is a big challenge for industrial-level production of ultrathin fibers by solution electrospinning because more than 70 wt% of the precursor solution is volatilizable organic solvent. In this paper, we report an interesting solventless electrospinning technique for the fabrication of poly(ethyl-2-cyanoacrylate)/polymethylmethacrylate (PECA/PMMA) fibers. The spinning solution only contains two components: ethyl-2-cyanoacrylate (ECA) monomer and PMMA, which are nearly all (>90%) electrospun into fibers at room temperature. The fiber solidification mechanism during the electrospinning process could be ascribed to the rapid polymerization of the ECA monomer in the presence of water vapour (specifically hydroxide ions) in the atmosphere, which is quite different from the conventional solvent evaporation in solution electrospinning or the fiber cooling mechanism in melt electrospinning. In addition, the morphology, structure, and influence of temperature and PMMA concentration have also been studied. The results may give some stimulation for developing new ecofriendly electrospinning methods. © 2013 The Royal Society of Chemistry. Source


Wan Y.,Qingdao University | Wan Y.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | Cai Z.-Y.,National University of Singapore | Jia M.-H.,Qingdao University | And 5 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2014

Two kinds of non-closely packed binary colloidal crystal were fabricated using polystyrene (PS)particles as blocking units by improved vertical deposit method. The SEM images and reflectance spectra of the structure exhibit fine orderly structure obtained by this method. Using the non-closely packed PS colloid crystal as template, titania (TiO2) inverse opal was fabricated, which has high relative refractive index. ©, 2014, Chinese Ceramic Society. All right reserved. Source


Guo Y.,Qingdao University | Guo Y.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | Wan Y.,Qingdao University | Wan Y.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | And 4 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2014

Magnonic crystals are a new class of artificial magnetic material with periodicity, and the flow of spin waves can be manipulated by designing. The research history and basic mechanism of magnonic crystals were reviewed in this paper. The research progress and the main research direction at present are summarized; the challenges of the further research were analyzed, and the development foreground of magnonic crystals was forecasted. Source


Liu J.,Qingdao University | Liu J.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | Chen X.,Qingdao University | Chen X.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | And 6 more authors.
Optics Express | Year: 2013

An efficient, acousto-optically Q-switched, and compact Yb:Gd 3Ga5O12 laser oscillating around 1026 nm is demonstrated, producing an output power of 5.15 W at a pulse repetition rate of 2 kHz, with optical-to-optical and slope efficiencies being 35.8% and 52%, respectively. The generated laser pulses are 6.4 ns in duration (FWHM), with pulse energy and peak power amounting, respectively, to 2.58 mJ and 403 kW. ©2013 Optical Society of America. Source

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